Social Networking Online - Why do you do it?

Why do you use Facebook? MySpace? Twitter? FriendFeed?
 
It's always interesting to me to talk to someone about social networking online who isn't currently in the conversation. The most common response is "I don't get it. Why would you want to do that? I already talk to everyone I want to talk to. Why do I want to read that 'So-in-so is putting their socks on'?" 
 
Yet, any time someone decides to just try it out they get sucked it immediately and for each one the draw becomes something different. Why do you use them and what networks are you on?

This is a blog post by Robert Scoble's wife. He is a trailblazer in the social media scene and it's fascinating to hear her more 'normal' perspective.
http://maryamie.spaces.live.com/Blog/cns!9592F3DEF41537A3!4948.entry